Shelf



FIG. 1 is a perspective view showing my new design for a shelf.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a left side view thereof.

FIG. 6 is a top view thereof.

FIG. 7 is a bottom view thereof.

FIG. 8 is a bottom view thereof taken along the line 8-8 shown in FIG. 4.

FIG. 9 is a second perspective view thereof, shown in an alternative configuration; and,

FIG. 10 is a third perspective view thereof, shown in environmental use.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

CLAIM I claim the ornamental design for a shelf, as shown and described. 